Heart rate sensor



FIG. 1 is a perspective view of a heart rate sensor showing our new design;

FIG. 2 is a front view thereof, the rear view being a mirror image thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 2 with the internal parts omitted;

FIG. 8 is an enlarged view of an indicated portion shown in rectangle 8 of FIG. 1; and,

FIG. 9 is an enlarged view of an indicated portion shown in rectangle 9 of FIG. 7.

The dash-dash broken lines show portions of the heart rate sensor that form no part of the claimed design. The dot-dot-dash lines are for the sole purpose of indicating the portions of the figures which are shown enlarged in FIG. 8 and FIG. 9. 

CLAIM The ornamental design for a heart rate sensor, as shown and described. 